Weger Matthias, Maurer Jochen, Ludwig André, Gallmann Lukas, Keller Ursula
Opt Express. 2013 Sep 23;21(19):21981-90. doi: 10.1364/OE.21.021981.
Attosecond angular streaking measurements have revealed deep insights into the timing of tunnel ionization processes of atoms in intense laser fields. So far experiments of this type have been performed only with a cold-target recoil-ion momentum spectrometer (COLTRIMS). Here, we present a way to apply attosecond angular streaking experiments to a velocity map imaging spectrometer (VMIS) with few-cycle pulses at a repetition rate of 10 kHz and a high ionization yield per pulse. Three-dimensional photoelectron momentum distributions from strong-field ionization of helium with an elliptically polarized, sub-10-fs pulse were retrieved by tomographic reconstruction from the momentum space electron images and used for the analysis in the polarization plane.
阿秒角条纹测量揭示了对强激光场中原子隧穿电离过程时间的深刻见解。到目前为止，这类实验仅使用冷靶反冲离子动量谱仪（COLTRIMS）进行。在此，我们提出一种方法，将阿秒角条纹实验应用于速度成像光谱仪（VMIS），该光谱仪具有重复频率为10 kHz的少周期脉冲且每个脉冲具有高电离产率。通过对动量空间电子图像进行层析重建，获取了用椭圆偏振的亚10飞秒脉冲对氦进行强场电离的三维光电子动量分布，并用于偏振平面内的分析。
